Trait orx_fixed_vec::prelude::PinnedVecSimple

pub trait PinnedVecSimple<T>: PinnedVec<T>
where
    T: NotSelfRefVecItem,
{
    // Required methods
    fn insert(&mut self, index: usize, element: T);
    fn remove(&mut self, index: usize) -> T;
    fn pop(&mut self) -> Option<T>;
    fn swap(&mut self, a: usize, b: usize);
    fn truncate(&mut self, len: usize);
    fn clone(&self) -> Self
       where T: Clone;
}

PinnedVecSimple is a PinnedVec where the elements satisfy the trait bound T: NotSelfRefVecItem.

We never manually implement this trait. Instead:

• if V implements PinnedVec<T> for some T such that
• T implements NotSelfRefVecItem

=> then V auto-implements PinnedVecSimple.

Therefore, T: NotSelfRefVecItem is sufficient to inform that the elements of the vector do not hold references to each other. This is critical as it enables the safe versions of the following methods which are otherwise unsafe:

• insert
• remove
• pop
• swap
• truncate
• clone

Note that having NotSelfRefVecItem elements is actually the usual in rust, as the opposite is challenging. Safely and conveniently enabling such rust-difficult data structures (linked lists, trees, graphs, etc) is exactly the goal of the PinnedVec trait and benefiting data structures such as the orx_imp_vec::ImpVec.

NotSelfRefVecItem is a marker trait which is implemented for most primitives; however, one needs to implement for new types to explicitly state that the type is not self-referential.

Required Methods

fn insert(&mut self, index: usize, element: T)

Inserts an element at position index within the vector, shifting all elements after it to the right.

Panics

Panics if index >= len.

Safety

insert operation for a PinnedVecSimple where the elements are T: NotSelfRefVecItem is safe; in this case, pinned vector shares the same safety requirements as std::vec::Vec which is readily provided by the borrow checker.

fn remove(&mut self, index: usize) -> T

Removes and returns the element at position index within the vector, shifting all elements after it to the left.

Panics

Panics if index is out of bounds.

Safety

remove operation for a PinnedVecSimple where the elements are T: NotSelfRefVecItem is safe; in this case, pinned vector shares the same safety requirements as std::vec::Vec which is readily provided by the borrow checker.

fn pop(&mut self) -> Option<T>

Removes the last element from a vector and returns it, or None if it is empty.

Safety

pop operation for a PinnedVecSimple where the elements are T: NotSelfRefVecItem is safe; in this case, pinned vector shares the same safety requirements as std::vec::Vec which is readily provided by the borrow checker.

fn swap(&mut self, a: usize, b: usize)

Swaps two elements in the slice.

If a equals to b, it’s guaranteed that elements won’t change value.

Arguments

• a - The index of the first element
• b - The index of the second element

Safety

swap operation for a PinnedVecSimple where the elements are T: NotSelfRefVecItem is safe; in this case, pinned vector shares the same safety requirements as std::vec::Vec which is readily provided by the borrow checker.

fn truncate(&mut self, len: usize)

Shortens the vector, keeping the first len elements and dropping the rest.

If len is greater than the vector’s current length, this has no effect.

fn clone(&self) -> Self

where T: Clone,

Creates and returns a clone of the vector.

Safety

clone operation for a PinnedVecSimple where the elements are T: NotSelfRefVecItem is safe; in this case, pinned vector shares the same safety requirements as std::vec::Vec which is readily provided by the borrow checker.

Object Safety

This trait is not object safe.

Implementors

impl<T, V> PinnedVecSimple<T> for V

where T: NotSelfRefVecItem, V: PinnedVec<T>,